Battery flashing when charging

Sleep & Recovery
1

Gen 4 battery has started flashing red under charge. What does that indicate?

2

Hi @moejiller,

If your WHOOP Gen 4 battery is flashing red while charging, that means it’s under 5% - it’s charging, but super low.

If the red flashing sticks around for a while or it doesn’t seem to charge right, try this:

  • Make sure you’re using the WHOOP-certified USB-C cable and adapter.
  • Check and clean the USB-C port on the battery (dust can mess with the connection).
  • Charge it in a temp-controlled spot—nothing too hot or cold.
  • Update the battery firmware using the Battery Pack Updater tool.
3

Looks like the battery is not connecting via the usb port. light turns red upon connection but then promptly turns off. Whoop battery Updater App never recognized the battery - thus I can not run a diagnosis. This is the only Diagnosis log I could find.

(Attachment battery_pack_updater.log is missing)

4

Looks like the battery is not connecting via the usb port. light turns red upon connection but then promptly turns off. Whoop battery Updater App never recognized the battery - thus I can not run a diagnosis. This is the only Diagnosis log I could find. Looks like I do not know how to attach the log to this reply